Multiple Choice
Can two atoms with the same mass number ever be isotopes of each other?
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2. Atoms & Elements
Isotopes
Multiple Choice
Which of the following is closest to the natural abundance of the isotope Br-79?
A
75.4%
B
10.2%
C
50.7%
D
23.1%
Verified step by step guidance1
Understand that natural abundance refers to the percentage of a specific isotope found naturally in a sample of an element.
Recall that bromine (Br) has two main isotopes: Br-79 and Br-81, and their natural abundances must add up to 100%.
Recognize that the natural abundance of Br-79 is approximately half of the total bromine isotopes, so it should be close to 50%.
Compare the given options (75.4%, 10.2%, 50.7%, 23.1%) to the expected value near 50%, identifying 50.7% as the closest to the natural abundance of Br-79.
Confirm that the natural abundance values are consistent with known isotopic distributions for bromine, where Br-79 and Br-81 are roughly equally abundant.
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